Taller antenna. People used to know how to erect towers or telephone poles to hang a large antenna to watch The Honeymooners and Leave it to Beaver.
And if that doesn't work, we're talking about a fraction of a percent of people in the US.
Personally, I like to issue advice that will benefit the largest amount of people, and let those few who have to deal with adverse conditions figure out how to deal with their problems on their own. Most people alive today don't even realize they have the choice to receive entertainment in nearly every corner of the US for absolutely free. They've been brainwashed by the cable and satellite TV companies, mobile device companies, and cable TV media companies into believing this fallacy. Some of the "cord cutters" don't even realize this and think that the only alternative is streaming TV over the interwebs.
At the very least, it's a good thing that people aren't anchored down to one place, and can choose to move if it's no longer desirable to them to pay for things that 99.some percent of the people in the country can get for free.
Broadcast stations cover on average within a radius of much more than 100 miles if the person on the receiving end puts up a decent antenna. I have a modest antenna at only 20 feet above ground, pointed at our metro's transmitter sites which is roughly 25 degrees away from the farthest major metro area I can receive. I plopped a path on Google Earth Pro between their station and my home, and came up with 95.06 miles to their transmitter site. I can get them just fine on my setup. The other closest metro has a transmitter which is 48.2 miles off the back side of my antenna. I can watch more than 60 channels absolutely free. Terrain in this area is a piedmont, which has modest rolling hills as well as large areas of flat land. Farther out west on the plains, line-of-sight transmission can go 150 miles or more depending on the height of the receiving antenna. Mountainous areas are the most difficult, but only a small percentage of those areas are impossible to serve with broadcast television. If you can receive FM radio there, chances are good you can receive a TV signal with the proper equipment. In fact, the vast majority of television transmission facilities are erected in rural areas.
And that's my final point; just as our forefathers knew, an outside antenna is the way to get quality in your TV signal. If you're expecting decent performance on a set of rabbit ears and you're 40 miles from the transmitter, well, there's your problem.
